Style with Data Trigger for TextBox

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="RSS Reader">
<StackPanel xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="200">
<StackPanel.Resources>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text}" Value="disabled">
<Setter Property="IsEnabled" Value="False"/>
</DataTrigger>
</Style.Triggers>
<Setter Property="Background" Value="{Binding RelativeSource={RelativeSource Self}, Path=Text}"/>
</Style>
</StackPanel.Resources>
<TextBox Margin="3"/>
</StackPanel>
</Window>
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| 11. | TextBox MouseLeftButtonDown action and PreviewMouseLeftButtonDown action | |  |
| 12. | Mark the text control as being changed to prevent any text content or selection changed events | |  |
| 13. | Listen to TextBox text changed event | |  |
| 14. | Handler for the PreviewKeyDown event on the TextBox | |  |
| 15. | Format TextBox with MenuItem: normal, bold, italic | |  |
| 16. | TextBox: set text, select all, clear, prepend, insert, append, cut, paste, undo | |  |
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| 19. | Scroll TextBox | |  |
| 20. | TextBox text changed event | |  |
| 21. | TextBox TextChanged event | |  |
| 22. | Use TextBox.CommandBindingst to bind command | |  |
| 23. | Use Dictionary to record which textbox has been changed and not saved | |  |
| 24. | Set TextBox ContextMenu to null | |  |
| 25. | TextBox Selection start, end and selected text | |  |
| 26. | Scrollable TextBox Column | |  |
| 27. | Check Spelling Error | |  |